linux-kernel - Re: [PATCH 00/16] vdpa: Add support for vq descriptor mappings

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Date:   Thu, 14 Sep 2023 23:34:20 -0700
From:   Si-Wei Liu <si-wei.liu@...cle.com>
To:     Eugenio Perez Martin <eperezma@...hat.com>,
        Lei Yang <leiyang@...hat.com>
Cc:     Dragos Tatulea <dtatulea@...dia.com>,
        Jason Wang <jasowang@...hat.com>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, Parav Pandit <parav@...dia.com>,
        Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, kvm@...r.kernel.org
Subject: Re: [PATCH 00/16] vdpa: Add support for vq descriptor mappings



On 9/13/2023 9:08 AM, Eugenio Perez Martin wrote:
> On Wed, Sep 13, 2023 at 3:03 AM Lei Yang <leiyang@...hat.com> wrote:
>> Hi Dragos, Eugenio and Si-Wei
>>
>> My name is Lei Yang, a software Quality Engineer from Red Hat.  And
>> always paying attention to improving the live migration downtime
>> issues because there are others QE asked about this problem when I
>> share live migration status  recently. Therefore I would like to test
>> it in my environment. Before the testing I want to know if there is an
>> expectation of downtime range based on this series of patches? In
>> addition, QE also can help do a regression test based on this series
>> of patches if there is a requirement.
>>
> Hi Lei,
>
> Thanks for offering the testing bandwidth!
>
> I think we can only do regression tests here, as the userland part is
> still not sent to qemu.
Right. Regression for now, even QEMU has it, to exercise the relevant 
feature it would need a supporting firmware that is not yet available 
for now. Just stay tuned.

thanks for your patience,
-Siwei
>
>> Regards and thanks
>> Lei
>>
>>
>> On Tue, Sep 12, 2023 at 9:04 PM Dragos Tatulea <dtatulea@...dia.com> wrote:
>>> This patch series adds support for vq descriptor table mappings which
>>> are used to improve vdpa live migration downtime. The improvement comes
>>> from using smaller mappings which take less time to create and destroy
>>> in hw.
>>>
>>> The first part adds the vdpa core changes from Si-Wei [0].
>>>
>>> The second part adds support in mlx5_vdpa:
>>> - Refactor the mr code to be able to cleanly add descriptor mappings.
>>> - Add hardware descriptor mr support.
>>> - Properly update iotlb for cvq during ASID switch.
>>>
>>> [0] https://lore.kernel.org/virtualization/1694248959-13369-1-git-send-email-si-wei.liu@oracle.com
>>>
>>> Dragos Tatulea (13):
>>>    vdpa/mlx5: Create helper function for dma mappings
>>>    vdpa/mlx5: Decouple cvq iotlb handling from hw mapping code
>>>    vdpa/mlx5: Take cvq iotlb lock during refresh
>>>    vdpa/mlx5: Collapse "dvq" mr add/delete functions
>>>    vdpa/mlx5: Rename mr destroy functions
>>>    vdpa/mlx5: Allow creation/deletion of any given mr struct
>>>    vdpa/mlx5: Move mr mutex out of mr struct
>>>    vdpa/mlx5: Improve mr update flow
>>>    vdpa/mlx5: Introduce mr for vq descriptor
>>>    vdpa/mlx5: Enable hw support for vq descriptor mapping
>>>    vdpa/mlx5: Make iotlb helper functions more generic
>>>    vdpa/mlx5: Update cvq iotlb mapping on ASID change
>>>    Cover letter: vdpa/mlx5: Add support for vq descriptor mappings
>>>
>>> Si-Wei Liu (3):
>>>    vdpa: introduce dedicated descriptor group for virtqueue
>>>    vhost-vdpa: introduce descriptor group backend feature
>>>    vhost-vdpa: uAPI to get dedicated descriptor group id
>>>
>>>   drivers/vdpa/mlx5/core/mlx5_vdpa.h |  31 +++--
>>>   drivers/vdpa/mlx5/core/mr.c        | 191 ++++++++++++++++-------------
>>>   drivers/vdpa/mlx5/core/resources.c |   6 +-
>>>   drivers/vdpa/mlx5/net/mlx5_vnet.c  | 100 ++++++++++-----
>>>   drivers/vhost/vdpa.c               |  27 ++++
>>>   include/linux/mlx5/mlx5_ifc.h      |   8 +-
>>>   include/linux/mlx5/mlx5_ifc_vdpa.h |   7 +-
>>>   include/linux/vdpa.h               |  11 ++
>>>   include/uapi/linux/vhost.h         |   8 ++
>>>   include/uapi/linux/vhost_types.h   |   5 +
>>>   10 files changed, 264 insertions(+), 130 deletions(-)
>>>
>>> --
>>> 2.41.0
>>>